Viggo valdemax julius amdreseit



'vIcGo-vALnEMAn JULIUS ANDRESEN, on cornmmenn, .iinnMAnK.

No Drawing.

i To all whom it may concern:

Be it known that I, Vmco VALDEMAR JULIUS 'ANnREsnN, a subject of the King of Denmark, and residing at Copenhagen, Denmark, have invented certain new and I useful Improvementsin' Methods of Making Dental Cements, ofwhich the following is a specification. n

The present invention has reference to 1mprovements' in' the manufacture of dental cements, and relates more speclfically toa f method for making a novel hydraulic cement able liqui ',.for instance water, and I have.

intended for'use in dental practice for various purposes, for instance as temporary filling for hollow teeth, or in the case of deciduous teeth-of children as a permanent filling, also :in the treatment of crowded teeth for separatlngthem, owing to Its prop- .erty to expand to some extent on hardening.

The main value of my new cementitious preparatlon, asidefrom 1ts purely mechanical stoppingiaction, resides in the'facttha't it causes local(dentme) anethesia and sterilize'sthe parts und r treatment, withoutthe' accompaniment of injurious caustic action;

7 In carrying out my invention I-work up zinc oxid and alum, or substances containing or 'formin these combinations, with a suitfound that a mixture of not less than 3 parts of zinc oxid with 1 part of alum and enough water to form a paste, will yield a good cement.

such a cement, I may also work up the zinc oxid and the alum w thoil of cloves, eugenol,

concentrated solution of sulfatejof zinc or' of chlorid of zinc, phosphoric acid, or with mixture of two or more of these substances, or with aproduct of condensation of eugenol and formaldehyde.

' The thlis prepared more or lessfplastic cement is then ready for immediate use; it will set slowly will-harden more quickly 1n water.--

Specification of Letters Patent.

the'anesthetizin depth action.- For enhancing the depth action of the dentine anesthetizin'g property ofwhen exposed; to air, but- Patented Ju1 '22, 1919 Applicationfiled January 27,1919 Serial No. 273,268. r i

' A good mixture is: parts of zinc oxid,

1 5 parts of burnt alum, and 15 parts of .eugenol, oil ofcloves, phosphoric acid, sulfate of zinc, or chlorid of zinc; If for preparing the cement, instead of water, one or more of the other above men tioned fluids are used, it will be found that V the mass, when in position in the tooth ca'vex n to ity, will take up saliva. andthen some degree during hardening. a

In further enlargement-of myinvention I may admix to the zincloxid and thefalum a product of condensation of eugenol and formaldehyde, in which case I first, heat; about parts of burnt alum. i What I claim is 1. The method of making a dental schism,

which consists in working up zinc oxid and '2. The method of making a dental cement,

of zincioxid, 1 parts of water.

a The method of mak g a deaalament,

which consists of working upv into a paste,

, alum with a liquid'or fiuldto form a paste.

zine oxid, alum and a substance enhancing The I e o ofmaking-a dental cementf the anesthetizing depth action. v

5. The method of makinga dental cement,

which consists in working-11p mtoa' a'ste,

zinc oxid, alum, and a productof'con ensa tion of eugenol and formaldehyde, in a ratio of45z-15z15z2.

vicco YALDEMAR Janus ANDRESEN. 

